Canada, yes, no first hand info for anywhere else. However, nearly all mortgages are founded upon promissory notes, which are 'monitized' (most likely with the use of a foil star made of GOLD) and put on them and sold for under face value in packages internationally.

But, nearly every country, at one time or another issued gold or silver coins or notes backed by a reserve of such coins, in those countries that would most likely be lawful moneyas issued and not debt bearing.

Again, since I am NOT a high level banker/insider, I do not know exactly how that works, but I do know the reason for putting a Postage Stamp on promissory notes here is done because the stamps are actual MONEY and give the NOTE at least some real value.(the ones with a Cent or Dollar value on them anyway, FOREVER stamps are NOT money and are, in fact, elastic debt currency).